[server] fix anonymous_user predicate in tests
devtools' TestServerConfiguration overrides the anonymous_user method,
but not the anonymous-user config option, so testing for the latter
would give the wrong result. Closes #3996664.
Add some entities
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As manager, you can access to entity creation forms by using the `site management`_ page.
.. _`site management`: manage
As regular user, the index page or the action box may propose some links to create entities according to the context.